Add sound about sandal2 HOT 2 OPEN

Also create a global sound management to load sounds at the beginning of the program then use them when needed with their index

from sandal2.

Add a "register sound" function to add a global sound, and return its index for future use

Add a window music played when the window has the focus

Add a sound by events for Windows and elements

Add sound binding to animation transition

from sandal2.